Duncan Mcewan / Silk button spangle galls on Oak casued by Wasp (Neuroterus albipes). Scotland, UK, Europe

Robert Thompson / Spangle gall wasp (Neuroterus quercusbaccarum) galls on oak leaf, Clare Glen, County Armagh, Northern Ireland, October.

Colin Varndell / Silk button galls on the underside of Pedunculate oak leaf (Quercus robur) caused by the Gall wasp (Neuroterus numismalis). Dorset, UK, September.

Colin Varndell / Common spangle galls of Cynipid wasp (Neuroterus quercusbaccarum) on the underside of Pedunculate oak leaf (Quercus robur). Dorset, UK September.

Solvin Zankl / Knopper gall (Andricus quercuscalicis) on oak tree acorn, and Common spangle gall (Neuroterus quercusbaccarum) on oak tree leaf. Bavaria, Germany

Solvin Zankl / Oak spangle gall (Neuroterus numismalis) on oak tree leaf, Niedersechsische Elbtalaue Biosphere Reserve, Elbe Valley, Lower Saxony, Germany

Solvin Zankl / Common spangle gall (Neuroterus quercusbaccarum) on oak tree leaf. Niedersechsische Elbtalaue Biosphere Reserve, Elbe Valley, Lower Saxony, Germany, August.

Pascal Pittorino / Oak spangle gall (Neuroterus quercusbaccarum) on the underside of Downy oak (Quercus pubescens) leaf, Toulon, Var, Provence, France, October.

Adrian Davies / Silk button spangle galls on an English oak (Quercus robur) leaf caused by a gall wasp (Neuroterus numismalis), Surrey, England, UK, September.

Georgette Douwma / Silk button spangle galls caused by the gall wasp (Neuroterus numisalis) and Common spangle galls caused by another Gall wasp (Neuroterus quercusbaccarumon) on the underside of an English oak leaf (Qu...

Georgette Douwma / Silk button spangle galls caused by the Gall wasp (Neuroterus numisalis) and Common spangle galls caused by another gall wasp (Neuroterus quercusbaccarumon) on the underside of an English oak leaf (Qu...

Georgette Douwma / Close up of Common spangle galls caused by the gall wasp (Neuroterus quercusbaccarum) on the underside of an English oak (Quercus robur) leaf. UK.